/* 公共样式 */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html,body {
    height: 100%;

    background-image: url(../image/背景图.png);
    background-repeat: no-repeat;
    background-position: center;
    background-size: cover;
}

.nav {
    height: 50px;

    background-color: rgba(60, 63, 65, 70%);
    color: white;
    
    line-height: 50px;
    padding-left: 20px;

}



